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Continuity mistake: When Dudley is hit by the first button that flies off Aunt Marge, we can see a table beside him with a lamp and a picture on it. When it cuts to Dudley lying on the floor, we can see the lamp and the picture have changed position. (00:04:50)

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Continuity mistake: When Aunt Marge says "Actually, it's nothing to do with the father..." you see Aunt Petunia lift her right arm. When it cuts her arm is down. (00:03:45)

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Continuity mistake: When Potter is leaning over the bed watching the 'Monster Book of Monsters' on the floor when it goes back under the bed, we can see the sheets on the edge are fine. When it cuts they are crinkled. (00:15:05)

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Continuity mistake: When Potter spots the dog at the bus stop he stumbles backwards and falls onto the pavement. Then we see the bus light come at him. When it cuts we see the bus come around the corner. How could the light be shining on him when the bus wasn't coming at him at all? (00:07:50)

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Continuity mistake: At the dinner table when Aunt Marge says "Vernon, do something" the cloth in front of her on the table is fine. When it cuts the cloth is crinkled. (00:04:30)

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Continuity mistake: When Snape points his wand at the Marauder Map and says, "Reveal your secrets," you can see Potter has his right hand down. When the scene cuts, his right hand is holding the map. (01:13:00)

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Continuity mistake: After Potter has opened the 'Monster Book of Monsters' he stumbles backwards and climbs onto the bed. When it cuts we see him climbing up again. (00:14:45)

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Continuity mistake: When Stan Shunpike says, "Take it away Ernie," we see Ernie having a bite of his toast. He then puts his hand with the toast down to put the bus in gear, but when the view cuts back the toast is suddenly gone. (00:09:20)

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Continuity mistake: When Potter goes onto the bus he has his arms down. When in cuts he has his right arm in his pocket. (00:08:45)

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Continuity mistake: Outside Hagrid's when Cornelius Fudge says, "...shall be executed this day at sundown." you see Harry, Hermione and Ron hide behind some pumpkins. You can also see a crow standing on a pumpkin right in front of them. When it cuts from behind them that crow is gone. (01:22:45)

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Continuity mistake: When Lupin and Potter enters the classroom after Lupin got the Marauders Map from Snape, Lupin says "But quite frankly, I am astounded that you didn't hand it in." The way he holds the map change in the next shot. (01:14:35)

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Continuity mistake: After Harry boards the Knight Bus, Stan hands him his ticket. In the shot facing Stan he folds the paper and holds it between his index and middle fingers. However, in the shot facing Harry, the paper is straight and he holds it between his thumb and index finger. (00:09:30)

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Continuity mistake: When Potter and Hermione is following back in time down to Hagrid's you see Hermione leaning against a column before putting her arm down. When it cuts back she is still leaning against the column. (01:45:25)

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Continuity mistake: When Harry says, "I said we'll take you to the castle," to Pettigrew, you see Sirius pointing his wand at Pettigrew. When it cuts Sirius is standing next to Harry, but he is no longer pointing his wand. (01:32:45)

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Continuity mistake: When Tom pushes Harry to the chair you see him pushing with one arm only. When it cuts you can see him pushing with both arms. (00:12:40)

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Continuity mistake: When Potter, Weasley and the other kids are making all the animal noises and Potter makes the steam come out of his ears, we see Potter put his arms down. When it cuts from the outside we see Potter has his right arm up. (00:27:15)

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Continuity mistake: When Trelawney looks in Potter's cup she is frightened and throws the cup on the table. We can see it landing with its handle inwards on the table. When it cuts the handle points outwards on the table. (00:29:30)

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Continuity mistake: When Potter points his wand at Vernon and Vernon says, "You're not allowed to use magic outside school," you see Vernon holding his hands down. When the scene cuts back to Vernon, he has his hand by the banister. (00:06:25)

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Continuity mistake: When Harry enters the Leaky Cauldron you see Tom bowing while stretching his left hand out. When it cuts he is holding his left hand behind his back. (00:12:00)

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Revealing mistake: When Neville opens his 'Monster Book of Monsters' he falls to the ground. Then he is lying on the ground and his book is attacking him again. We can see the pieces of pre-cut papers, that should be coming out of the book's mouth, actually come up from the ground, when Neville is holding the book above him. Obviously it's not real. (00:31:15)

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